The Souris River is a 700-kilometre (435-mile) winding prairie waterway that originates in Saskatchewan, Canada, crosses into North Dakota before turning north into Manitoba, and crosses the Canada-US boundary in two places. Flowing through cities and towns such as Weyburn, Saskatchewan, the river serves as an important regional water source and supports a diverse fishery across its length. The Souris River basin features soils well-suited to agriculture, and water apportionment is governed by an International Joint Commission Order administered by the International Souris River Board, which also monitors water quality throughout the system. The river offers anglers a genuine prairie fishing experience, with northern pike, walleye, and smallmouth bass among the most sought-after species along its course.